Concrete-mixing machine



F. D. CHAPMAN.

CONCRETE MIXING MACHINE.

APPLICATION FILED NOV.22,1915.

Patented Nov. 18, 1919.

2 SHEETS-SHEET 1.

fix

w INVENTUF? ATTO/ INEYE.

F. D. CHAPMAN.

CONCRETE MIXING MACHINE.

I APPLICATION FILED NOV-22.1915. 1,322,289

2 SHEETS-SHEET 2.

Patented Nov. 18, 1919.

/\/\/E/\/TG J"R ATTUFWEYE FRANK DALTON CHAPMAN, F BERLIN, WISCONSIN.

CONCRETE-MIXING MACHINE,

Specification of Letters Patent.

Patented Nov. 18, 1919.

Application filed November 22, 1915. Serial No. 62,714.

To all whom it may concern:

Be it known that I, FRANK DALTQN CHAP- MAN, a citizen of the UnitedStates, and resident of Berlin, in the county of Green Lake and State ofWisconsin, have invented new and useful Improvements in Concrete- MixingMachines, 'of which the following is a description, reference being hadto the accompanying drawings, which are a part of this specification. v

This invention relates to improvements in concrete mixing machines formixing cement, crushed stone, sand and water in formino' concrete. It isone of the objects of the present invention to provide a concrete mixingmachine in which the drum forming part of the mixer is directly rotatedby the shaft of the driving means mounted upon the same frame as themixer. y

A further object of the invention is to provide a concrete mixingmachine in which the drum is supported by and revolves in a ball bearingforming part of the frame.

A. further object of the invention is to provide a concrete mixingmachine in which the drum has mounted therein a series of mixing bladeswhich coact with one another in moving the material toward and away fromthe discharge end of the drum to thoroughly mix the material.

A further object of the invention is to provide a concrete mixingmachine in which the mixing drum is rotated by a worm and wormwheeldrive directly from the shaft of the motor mounted on the sameframe.

A further object of the invention is to provide a concrete mixingmachine which is of simple construction, is strong and durable and iswell adapted for the purpose described.

With the above and other objects in view the invention consists of theimproved concrete mixing machine and its parts and combinations as setforth in the claims, and all equivalents thereof.

In the accompanying drawings in which the same reference charactersindicate the same parts in all of the views:

Figure 1 is a transverse sectional view of the improved concrete mixingmachine taken on line 1-1 of Fig. 2;

Fig. 2 is a horizontal sectional view taken on line 2-2 of Fig. 1;

F ig. 3 is a longitudinal sectional view taken on line 3-3 of Fig. 1;

Fig. 4 is a detail view of the end of the drum; and

Fig. 5 is a diagrammatic plan view of the mixing drum and blades withthe drum rolled out in flat form.

. Referring to the drawings the numeral 8 indicates a suitablesupporting frame which is mounted on wheels 9. The supporting frame isformed of a transversely extendmg angle iron 10 to the ends of whichshort rear axles 11 are mounted. Atubular frame member 12 extendsrearwardly at right angles from the angle iron 10 and at its rear end isprovided with a caster wheel 13 for steering the frame. The tubularmember is braced to the angle iron by anguat a minimum cost.

.A drum supporting member 16 rigidly and adjustably mounted on thetubular member of the frame by U-shaped bolts 17,

extends upwardly therefrom at an angle and at its upper end has atwo-part annular drum bearing 18 mounted thereon. The axis of the drumbearing extends at right angles to the tubular member of the frame and amixing drum 19 extends revolubly through said bearing and is providedwith a wormwheel 20 formed integral therewith which extends between andis revolubly supported by the two parts of the two-part member. Thewormwheel 20 is formed with annular bearing shoulders 21 which registerwith the annular shoulders 22 of the drum bearing 18 to receive bearingballs 23 therebetween. The bearing balls 23 are positioned on each-sideof the wormwheel and form a firm bearing with a minimum amount offriction. Bolts 24 clamp the two parts of the two-part drum bearingtogether.

The drum is of conical shape with its charging-opening 25 in its largerend and its discharging openings 25 in its smaller end. The smaller endportion 27 of the drum including the wormwheel is formed of cast metaland is partly closed at the end and the larger end portion 28 is formedof sheet metal provided with a cast metal end plate 29 to reduce thediameter of the charging opening of the drum.

The axis of the drum is inclined upwardly to position the lowerperipheral edge portion thereof in a horizontal plane so that larlyextending brace bars 1 1 and a transmaterial within the drum willbeworke d In order to completelymix the material and to prevent the toorapid movement of the material toward the discharge end of the drum, thedrum is provided with a number of deflecting blades 30, 31, 32 and 33which extend at different angles'to work the material back and forth.'It will also be noted that the blades .30 and 31'are spaced inwardly agreater distance from the drum than the other blades. This arrangement;..of the blades permits some of the material to pass between the bladesand the side portions of the drum and divides thematerial 'into.difl'erent'moving stratas which move independentl of one another andmore completely mix t e material.

The lower portion of the drum bearing is formed with a chamber 34 toreceive a worm 35 which is: in mesh with the worm wheel 20. The worm 35is mounted on a shaft 36 which'is journaled inthe drum bearing and oneend of the shaft is in line with and is connected to the engine shaft 37by an interposed shaft 38 and universl coupling members 39. y

While the worm shaft is preferably shown as indirectly connected to theengine shaft 1 it iato be understood that the invention contemplates thedirect mounting of the worm shaft upon the extended gine shaft.The'motor 4O portion of the. en-

transverse brace bar 15 and ma type desired.

The discharge openings 26 at the small end of the drum are of segmentalform and are located diametrically opposite each other. The dischargeopenings are closed during the mixing operation by means of a be of anytrally, pivotally mounted on a pivot bolt 4-2 projecting rearwardly fromthe rear portion of the drum and revolves with said drum. A

coiled spring 43 surrounding the bolt and interposed between the head ofthe bolt and the segmental gate holds the said gate frictionally againstthe end of the um and in adjusted position. A ring 44 extending aroundand spaced from the rear portion of the drum'is connected tothesegmental gate by angular straps 45. The ring 44 serves as aconvenient handle for turning the gate to open or closed position butmay be dispensed with if desired.

porting ring, together with is mounted upon the transversely extendingangle iron 10 and the In operation the driun material through the chargthe drum is then rotated to mix the material. In mixing the material ismoved baekwardly and forwardly toward both is charged with dropsdownwardly and is thus completely the gate is turned to open positionand during the rearward movement of the material end-portion sustainsthe load of the drum,

and as its Worm-gear is formed with annular shoulders 21 on each sidethereof, and which cooperate with the shoulders 22 on the suptheball-bearings 23, provides a bearing for the drum which will preventtilting in either direction with respect to its rigid supporting ring.The supporting ring also forms a housing for the worm and its gearing,thereby protecting it from dirt and grit.

From the foregoing description it will be seen that the concrete mixingmachine is of and is well adapted very simple construction for thepurpose described.

What I claim as my invention is:

I. A concrete mixing machine, a conical mixing drum formed tively heavysmall-end portion and a relatively light large-end portiontelescopically fitting in said small-end portion and supported thereby,said small-end portion being provided with a closable discharge gate atits rearend and a worm-gear extending around its front edge and formedwith an annular shoulder at each side of the gear, a supportingrmgengaging around said wormgear also provided with annular shoulderswhichregister with theshoulders on the supporting ring, said supportingring forming a sole support for the mixing drum, bearing balls mountedbetween .the registering shoal ders of the worm-gear and supporting rirna worm mounted in the supportin ring in meslrwith the worm-gear forrotating the mixing drum, and means for securing said supporting ring toa main support.

2. A concrete mixing machine, comprising a mixing drum formed with aworm-gear around its periphery intermediate its ends, a supporting ringinclosing and formed with a closed chamber at its lower side, asupporting member secured to the lower side of said supporting ring andprovided with a single cylindrical bearing member at its lower endadapted to be ends of the drum and is also carried upwardly by the drumand the blades and then ing opening and mixed. When mixed single supdrumbearformed 1 comprising of a relasaid worm-gear clamped to a singlelongitudinally extending member of a main support, a worm mounted insaid closed chamber of said supportmg ring and in mesh w1th saidworm-gear to rotate said mixing drum, and means for I drum, a supportfor the same, means for rotating said drum, and a series of relativelylong deflecting blades secured to the interior of said drum free fromeach other and extending at different angles for deflecting the materialback and forth in the drum, said blades being mounted spacedrespectively at different distances from the wall of the drum, wherebystratas'of material of diflerent thicknesses will be formed in the drumduring the mixing operation.

In testimony whereof I afiix my signature, 30

in presence of two witnesses.

FRANK DALTON CHAPMAN.

Witnesses:

W. N. CRAWFORD,---. A. L. PARDY.

